It's probably a head gasket problem.
Interference engine.
The engine block coolant drain plug on a 350 Chevy Tahoe is above the oil pan, mid engine on driver's side
Place something to catch the engine coolant beneath your 1990 Chevy Corsica radiator. Remove the radiator drain plug with a 9/16 ratchet. The engine coolant will drain out.
Engine coolant temp circuit high input. The engine coolant temp sensor make be bad.
Look on the side of the coolant overflow bottle. There should be a low mark for the coolant for a cool engine, and one for a hot engine.
Depends on what engine and what year Monte Carlo you're referring to...
The engine block coolant drain plug on 4.3 liter Chevy Blazer is located on the bottom of the engine, near the oil filter. It allows coolant to be completely drained from the block during maintenance.
The coolant enters the engine by way of the lower radiator hose and exits the engine by way of the upper radiator hose.
On the bottom of the engine.
Dex-cool
drivers side of engine block
A 1997 Chevy Cavalier uses a standard 50/50 mix of antifreeze coolant and water. This keeps the engine from overheating and from freezing in the winter.